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This API and implementation comes from the Unreal Engine branch of SDL, which originally called this "SDL_ConfineCursor". Some minor cleanup and changes for consistency with the rest of SDL_video, but there are two major changes: 1. The coordinate system has been changed so that `rect` is _window_ relative and not _screen_ relative, making it easier to implement without having global access to the display. 2. The UE version unset all rects when passing `NULL` as a parameter for `window`, this has been removed as it was an unused feature anyhow. Currently this is only implemented for X, but can be supported on Wayland and Windows at minimum too.
Simple DirectMedia Layer (SDL) Version 2.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)